The concrete slab of a basement is 11 m long, 8 m wide, and 0.3 m thick. During the winter, temperatures are nominally 17∘ C and 10∘ C at the top and bottom surfaces, respectively. If the concrete has a thermal conductivity of 1.4 W/m⋅K, what is the rate of heat loss through the slab, in W? If the basement is heated by a gas furnace operating at an efficiency of ηf=0.90 and natural gas is priced at Cg=$0.02/MJ, what is the daily cost of the heat loss, in dollars per day?
q=Cd=W$/d